Condensed Statements of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 1,758,000	$ 958,000	$ 2,486,000	$ 1,880,000
Cost of goods sold	1,176,000	652,000	1,714,000	1,269,000
Gross profit	582,000	306,000	772,000	611,000
Operating expenses:
Research and development	19,000	20,000	52,000	39,000
Selling and marketing	230,000	107,000	319,000	219,000
General and administrative	317,000	334,000	656,000	682,000
Total operating expenses	566,000	461,000	1,027,000	940,000
Operating income / (loss)	16,000	(155,000)	(255,000)	(329,000)
Other (expense) / income:
Interest expense	(37,000)	(67,000)	(91,000)	(134,000)
Other income, net	0	168,000	0	169,000
Total other (expense) / income	(37,000)	101,000	(91,000)	35,000
Net loss before tax	(21,000)	(54,000)	(346,000)	(294,000)
Income tax expense	0	(2,000)	0	(2,000)
Net loss	$ (21,000)	$ (56,000)	$ (346,000)	$ (296,000)
Basic and diluted loss per common share	$ (0.00)	$ (0.00)	$ (0.01)	$ (0.01)
Weighted average number of shares outstanding - basic & diluted	35,905,948	32,521,675	34,937,236	32,445,244